<template>
  <div class="cpm-container">
    <h3>发表评论</h3>
    <hr />
    <textarea placeholder="请输入要输入的内容（最多120字）" maxlength="120" v-model="mycomment"></textarea>
    <mt-button type="primary" size="large" @click="postComment">发表评论</mt-button>
    <div class="cmt-list">
      <div class="cmt-item" v-for="(item,i) in commentsList" :key="item.add_time">
        <div
          class="cmt-title"
        >第{{i+1}}楼&nbsp;&nbsp;用户:{{item.user_name}}&nbsp;&nbsp;发表时间:{{item.add_time | dateFormat}}</div>
        <div class="cmt-body">{{item.content}}</div>
      </div>
    </div>
    <mt-button type="danger" size="large" plain @click="getMore">加载更多</mt-button>
  </div>
</template>

<script>
import { Toast } from "mint-ui";
export default {
  data() {
    return {
      pageIndex: 1, //默认显示第一页数据
      commentsList: [], //评论数据
      mycomment: ""
    };
  },
  created() {
    this.getCommnts();
  },
  methods: {
    getCommnts() {
      this.$http
        .get("api/getcomments/" + this.id + "?pageindex=" + this.pageIndex)
        .then(result => {
          console.log(result.body);
          if (result.body.status === 0) {
            // 每当获取新评论的时候，不要把老数据清空，而是应该用老数据，拼接新数据
            this.commentsList = this.commentsList.concat(result.body.message);
          } else {
            Toast("评论获取失败");
          }
        });
    },
    getMore() {
      //加载更多评论
      this.pageIndex++;
      this.getCommnts();
    },
    postComment() {
      // 发表评论
      // 参数1: URL地址
      // 参数2: 提交给服务器的数据对象  content(文档规定) : ...
      // 参数3:定义提交时候，表单中数据的格式 emulateJSON:true

      // 校验评论内容是否为空
      if (this.mycomment.length === 0) {
        Toast("评论内容不能为空");
      }
      this.$http
        .post("api/postcomment/" + this.$route.params.id, {
          content: this.mycomment
        })
        .then(result => {
          if (result.body.status === 0) {
            var cmt = {
              user_name: "匿名用户",
              add_time: Date.now(),
              content: this.mycomment
            };
            this.commentsList.unshift(cmt);
            this.mycomment = "";
          }
        });
    }
  },
  props: ["id"]
};
</script>

<style lang="scss" scoped>
.cpm-container {
  h3 {
    font-size: 18px;
  }
  textarea {
    font-size: 14px;
    height: 85px;
    margin: 0;
  }
  .cmt-list {
    margin: 5px 0;
    .cmt-item {
      font-size: 13px;
      .cmt-title {
        background-color: lightgray;
        line-height: 35px;
      }
      .cmt-body {
        text-indent: 2em;
      }
    }
  }
}
</style>
